Sorry for the long delay. Weather has been bad. But since my last post, I have been out quite a few nights and my solution did the trick. My lens is a Rokinon 135 f/2 and that is coupled to the adapter to an EFW and my asi178mm-cool. I could put together a before and after corner aberration comparison. There is still a slight hint of elongated stars in two corners, but I think that can be delt with a little more sanding of the adapter because I didn't get it down to perfect.

Sorry for the long delay. Weather has been bad. But since my last post, I have been out quite a few nights and my solution did the trick. My lens is a Rokinon 135 f/2 and that is coupled to the adapter to an EFW and my asi178mm-cool. I could put together a before and after corner aberration comparison. There is still a slight hint of elongated stars in two corners, but I think that can be delt with a little more sanding of the adapter because I didn't get it down to perfect.

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